If you fancy wagering on events whose outcome will be determined in the future, then NHL Futures are the bet for you. More often than not these type of best gain the most traction right before a season starts as people tend to predict outcomes such as Stanley Cup Winner, who makes the playoffs, who wins each division or conference etc.
Predicting the Stanley Cup winner a month before the season starts is difficult, hence why sometimes you can get really good odds if you back a team earlier than everyone else. For example you can back the Colorado Avalanche to repeat as champions this season for a solid +600 odds which would potentially earn you $600 for a $100 bet if they went all the way.
NHL Futures bets are available during the season as well, but odds do tend to change accordingly as the season progresses.